Rear mounted fuel tank

Modified FSJ Tech Area
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tgreese
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Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Rear mounted fuel tank

Postby tgreese » Fri Apr 21, 2017 4:48 am

You can always add a second gauge for the aux tank, if the sender does not work with the factory gauge. That seems like a more sensible addition than a convertor. I've thought about how to convert resistance ranges, and I think you could do it with a transistor and a few resistors. The difficulty would be the development time you'd need to make the circuit.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D

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HeavyMetalThunder_81
Posts: 343
Joined: Sat Mar 17, 2012 5:01 pm
Location: Whidbey Island, WA

Re: Rear mounted fuel tank

Postby HeavyMetalThunder_81 » Fri Apr 21, 2017 12:40 pm

tgreese wrote:You can always add a second gauge for the aux tank, if the sender does not work with the factory gauge. That seems like a more sensible addition than a convertor. I've thought about how to convert resistance ranges, and I think you could do it with a transistor and a few resistors. The difficulty would be the development time you'd need to make the circuit.

My rear tank setup will be completely replacing my factory fuel tank. I am liking the late '80s-early '90s Ford Econoline van rear tanks. Their sending units match up with our '73-'85 gauges, have in tank fuel pumps to work with my soon-to-be Holley fuel injection, and hopefully fit where the factory spare tire would go.
-Jonny B.
1979 Jeep Cherokee Golden Eagle - 5" lift, 33x12.5R15
AMC 360 - 4180, TFI/Hyfire, Headers, Dual Exhaust
TH400 - B&M Shift Improver, Deep Pan
D20 - Twin Stick'd
F D44 - 3.54:1, Open
R D44 - 3.54:1, Locked
Ristow wrote:the best advice on the thread.

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tgreese
Posts: 2361
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Rear mounted fuel tank

Postby tgreese » Fri Apr 21, 2017 1:28 pm

IIRC the in-tank pump for these applications is low pressure, and must be supplemented by a high pressure pump mounted externally. Look at the listings and you'll see two pumps for a single application.

Not a problem, but a little more complicated than the in-tank Chevy or Jeep setup.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D

User avatar
HeavyMetalThunder_81
Posts: 343
Joined: Sat Mar 17, 2012 5:01 pm
Location: Whidbey Island, WA

Re: Rear mounted fuel tank

Postby HeavyMetalThunder_81 » Fri Apr 21, 2017 7:08 pm

tgreese wrote:IIRC the in-tank pump for these applications is low pressure, and must be supplemented by a high pressure pump mounted externally. Look at the listings and you'll see two pumps for a single application.

Not a problem, but a little more complicated than the in-tank Chevy or Jeep setup.

You are correct. But the pumps mounted to those sending units are standard semi-universal pump. My plan is to swap it out with a higher pressure model from Walbro or Aeromotive.
-Jonny B.
1979 Jeep Cherokee Golden Eagle - 5" lift, 33x12.5R15
AMC 360 - 4180, TFI/Hyfire, Headers, Dual Exhaust
TH400 - B&M Shift Improver, Deep Pan
D20 - Twin Stick'd
F D44 - 3.54:1, Open
R D44 - 3.54:1, Locked
Ristow wrote:the best advice on the thread.


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